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The Berkeley Earth Surface Temperature is led by Physicist Richard Muller, a long-time critic of the scientific consensus on climate change. Muller is slated to testify on the effort before Congress on Thursday, in the first salvo of the Republican Class of 2010’s campaign to reexamine climate-change science. Temperature data, which is gathered from tens of thousands of weather stations across the globe, many of which have incomplete records, is Òvery contentious,Ó Muller said in an interview. ÒThe skeptics are raising legitimate concerns.Ó